Modular joint prosthesis stabilization and augmentation system

Abstract

A modular joint prosthesis system includes an articulation component having a bone engaging surface and an opposed articulation surface. Fixation peg members and/or augmentation components are selectively attachable to the bone engaging surface of the articulation component. The articulation component may be a cruciate sacrificing femoral component of a knee prosthesis.

What is claimed is: 
     
       1. A modular knee joint prosthesis system, comprising a femoral component having a superior bone engaging surface and an inferior articulation surface, the superior surface including at least one securement cavity, wherein the at least one securement cavity is defined by a sidewall and a bottom wall;   at least one fixation peg member, wherein the at least one fixation peg member is selectively matable with the at least one securement cavity of the superior surface of the femoral component, the at least one fixation peg member having a distal end, a proximal bone engaging end and an internal bore;   at least one collet member matable with a distal end of the at least one fixation peg member to selectively mate the at least one fixation peg member to the at least one securement cavity, wherein the at least one collet member has an expandable distal end adapted to fit within and selectively engage the sidewall of the at least one securement cavity and a proximal end including an internal bore, and   at least one expansion pin element having a proximal end including an external structure matable with the internal bore of the at least one fixation peg member and the internal bore of the at least one collet member, and a distal end capable of selectively expanding the at least one collet member such that the at least one collet member engages to the at least one securement cavity.   
     
     
       2. The system of claim 1, wherein the internal bore of the at least one fixation peg member includes an internally threaded portion. 
     
     
       3. The system of claim 2, wherein the internal bore of the at least one collet member includes an internally threaded portion. 
     
     
       4. The system of claim 3, wherein the external structure of the at least one expansion pin element comprises an external threaded region. 
     
     
       5. The system of claim 1, wherein the at least one collet member is integral with the at least one fixation peg and forms a distal end thereof. 
     
     
       6. The system of claim 4, wherein the at least one collet member is separate from the at least one fixation peg member, and wherein the at least one collet member includes an expandable distal end formed by two or more expandable wedge-like members each separated by a slot; and   a collar at a proximal end thereof.   
     
     
       7. The system of claim 6, wherein the collar of the at least one collet member seats upon the at least one securement cavity with the distal end of the at least one collet member extending therein such that the at least one expansion pin element is threadingly engaged within the internally threaded region of an axial bore of the at least one collet member and the internally threaded region of the at least one fixation peg member. 
     
     
       8. The system of claim 7 further comprising at least one augmentation block having first and second opposed surfaces and an aperture extending therebetween, the first surface of the at least one augmentation block being mountable upon a portion of the superior surface of the femoral component and the aperture being dimensioned to receive the distal end of the at least one collet member such that the at least one augmentation block and the at least one fixation peg member are together selectively matable with an articulation component. 
     
     
       9. The system of claim 8 wherein the articulation component is a femoral component of a knee joint prosthesis. 
     
     
       10. The system of claim 8 wherein in the femoral component is a cruciate substituting femoral component including an intercondylar notch formed on the superior surface thereof. 
     
     
       11. The system of claim 10, wherein the at least one securement cavity is formed on each of a medial distal flat and a lateral distal flat of the femoral component. 
     
     
       12. The system of claim 4, wherein the at least one fixation peg member has a length in the range of 2 to 60 mm. 
     
     
       13. The system of claim 8, wherein the at least one fixation peg member decreases in diameter from an end adjacent one of the superior surface of the at least one augmentation block and the superior surface of the articulation component to the proximal end thereof. 
     
     
       14. The system of claim 13, wherein the at least one fixation peg member includes external surface features. 
     
     
       15. The system of claim 14 wherein the external surface features are selected from the group consisting of axial ribs, axial grooves, annular ribs and annular grooves. 
     
     
       16. The system of claim 4, wherein the at least one collet member has two or more wedge-shaped structures at a distal end thereof. 
     
     
       17. The system of claim 13, wherein the bore formed in the at least one fixation peg member extends from an opening in the distal end to a closed proximal end. 
     
     
       18. A modular joint prosthesis system, comprising: an articulation component having a first, bone engaging surface and a second, articulation surface, the first surface including at least one securement cavity, wherein the at least one securement cavity is defined by a sidewall and a bottom wall;   at least one fixation peg member, wherein the at least one fixation peg member is selectively matable within the at least one securement cavity on the first surface of the articulation component and the at least one fixation peg member has a distal end including at least one collet member that is engageable with the at least one securement cavity, a proximal bone engaging end and an axial bore extending between the distal and proximal ends of the at least one fixation peg member; and   at least one expansion pin element having a proximal end including at least one external structure matable within the axial bore of the at least one fixation peg member, the at least one expansion pin element further including a distal end capable of selectively expanding the at least one collet member such that the at least one collet member engages with the at least one securement cavity.   
     
     
       19. The system of claim 18, wherein an axial bore of the at least one fixation peg member includes an internally threaded region. 
     
     
       20. The system of claim 19, wherein the at least one external structure of the at least one expansion pin element comprises a threaded region. 
     
     
       21. The system of claim 20 further comprising at least one augmentation block having first and second opposed surfaces and an aperture extending therebetween, the first surface of the at least one augmentation block being mountable upon the first surface of the articulation component, and the aperture being dimensioned to receive the at least one fixation peg member such that the at least one augmentation block and the at least one fixation peg are together selectively matable with the articulation component. 
     
     
       22. The system of claim 21 wherein the articulation component is a femoral component of a knee joint prosthesis. 
     
     
       23. The system of claim 21 wherein the femoral component is a cruciate substituting femoral component including an intercondylar notch formed on the first surface thereof. 
     
     
       24. The system of claim 22, wherein the at least one securement cavity is formed on each of the medial distal flat and the lateral distal flat of the femoral component. 
     
     
       25. The system of claim 20, wherein the at least one fixation peg member has a length in the range of 2 to 60 mm. 
     
     
       26. The system of claim 25, wherein the at least one fixation peg member decreases in diameter from the distal to the proximal end thereof. 
     
     
       27. The system of claim 25, wherein the at least one fixation peg member includes external surface features. 
     
     
       28. The system of claim 27, wherein the external surface features are selected from the group consisting of axial ribs, axial grooves, annular ribs and annular grooves. 
     
     
       29. The system of claim 20, wherein the at least one collet member has two or more wedge-shaped structures at a distal end thereof. 
     
     
       30. A modular joint prosthesis system, comprising: an articulation component having a first, bone engaging surface and a second, articulation surface and at least one securement cavity formed in the first surface, wherein the at least one securement is defined by a sidewall and a bottom wall;   at least one fixation peg member, wherein the at least one fixation peg member is selectively matable with the at least one securement cavity on the first surface of the articulation component, the at least one fixation peg member having a distal end, a proximal bone engaging end and an axial bore formed therein, the axial bore including internal threads;   at least one collet member having a distal end including two or more expandable wedge elements that are able to selectively engage the with the at least one securement cavity and a bore extending therethrough, at least a proximal portion of the bore including an internally threaded portion; and   at least one expansion pin element having a distal end able to expand the distal end of the at least one collet member and a proximal end including external threads, the at least one expansion pin element being insertable within the axial bore of the at least one fixation peg and the at least one collet member such that the external threads of the at least one expansion pin element mate with the internal threads of the at least one fixation peg and the internally threaded portion of the at least one collet member.   
     
     
       31. The system of claim 30, wherein the at least one collet member is integral with the distal end of the at least one fixation peg member. 
     
     
       32. The system of claim 30 further comprising an augmentation block having a first surface mountable upon a portion of the first surface of the articulation component, a second opposed surface and an aperture extending between the first and second surfaces.